From: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
To: tpmdd-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org
Cc: peterhuewe@gmx.de, gregkh@linuxfoundation.org,
jgunthorpe@obsidianresearch.com, dhowells@redhat.com,
artem.bityutskiy@linux.intel.com,
Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>,
Tejun Heo <tj@kernel.org>, NeilBrown <neilb@suse.de>,
Guenter Roeck <linux@roeck-us.net>,
"Eric W. Biederman" <ebiederm@xmission.com>
Subject: [PATCH 03/10] sysfs: added __compat_only_sysfs_link_entry_to_kobj()
Date: Fri, 16 Oct 2015 21:40:22 +0300 [thread overview]
Message-ID: <1445020843-9382-4-git-send-email-jarkko.sakkinen@linux.intel.com> (raw)
In-Reply-To: <1445020843-9382-1-git-send-email-jarkko.sakkinen@linux.intel.com>
Added a new function __compat_only_sysfs_link_group_to_kobj() that adds
a symlink from attribute or group to a kobject. This needed for
maintaining backwards compatibility with PPI attributes in the TPM
driver.
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
---
fs/sysfs/group.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
include/linux/sysfs.h | 11 +++++++++++
2 files changed, 55 insertions(+)
diff --git a/fs/sysfs/group.c b/fs/sysfs/group.c
index 39a0199..e123659 100644
--- a/fs/sysfs/group.c
+++ b/fs/sysfs/group.c
@@ -352,3 +352,47 @@ void sysfs_remove_link_from_group(struct kobject *kobj, const char *group_name,
}
}
EXPORT_SYMBOL_GPL(sysfs_remove_link_from_group);
+
+/**
+ * __compat_only_sysfs_link_entry_to_kobj - add a symlink to a kobject pointing
+ * to a group or an attribute
+ * @kobj: The kobject containing the group.
+ * @target_kobj: The target kobject.
+ * @target_name: The name of the target group or attribute.
+ */
+int __compat_only_sysfs_link_entry_to_kobj(struct kobject *kobj,
+ struct kobject *target_kobj,
+ const char *target_name)
+{
+ struct kernfs_node *target;
+ struct kernfs_node *entry;
+ struct kernfs_node *link;
+
+ /*
+ * We don't own @target_kobj and it may be removed at any time.
+ * Synchronize using sysfs_symlink_target_lock. See sysfs_remove_dir()
+ * for details.
+ */
+ spin_lock(&sysfs_symlink_target_lock);
+ target = target_kobj->sd;
+ if (target)
+ kernfs_get(target);
+ spin_unlock(&sysfs_symlink_target_lock);
+ if (!target)
+ return -ENOENT;
+
+ entry = kernfs_find_and_get(target_kobj->sd, target_name);
+ if (!entry) {
+ kernfs_put(target);
+ return -ENOENT;
+ }
+
+ link = kernfs_create_link(kobj->sd, target_name, entry);
+ if (IS_ERR(link) && PTR_ERR(link) == -EEXIST)
+ sysfs_warn_dup(kobj->sd, target_name);
+
+ kernfs_put(entry);
+ kernfs_put(target);
+ return IS_ERR(link) ? PTR_ERR(link) : 0;
+}
+EXPORT_SYMBOL_GPL(__compat_only_sysfs_link_entry_to_kobj);
diff --git a/include/linux/sysfs.h b/include/linux/sysfs.h
index 9f65758..ea090ea 100644
--- a/include/linux/sysfs.h
+++ b/include/linux/sysfs.h
@@ -268,6 +268,9 @@ int sysfs_add_link_to_group(struct kobject *kobj, const char *group_name,
struct kobject *target, const char *link_name);
void sysfs_remove_link_from_group(struct kobject *kobj, const char *group_name,
const char *link_name);
+int __compat_only_sysfs_link_entry_to_kobj(struct kobject *kobj,
+ struct kobject *target_kobj,
+ const char *target_name);
void sysfs_notify(struct kobject *kobj, const char *dir, const char *attr);
@@ -451,6 +454,14 @@ static inline void sysfs_remove_link_from_group(struct kobject *kobj,
{
}
+static inline int __compat_only_sysfs_link_entry_to_kobj(
+ struct kobject *kobj,
+ struct kobject *target_kobj,
+ const char *target_name)
+{
+ return 0;
+}
+
static inline void sysfs_notify(struct kobject *kobj, const char *dir,
const char *attr)
{
--
2.5.0
next prev parent reply other threads:[~2015-10-16 18:41 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-16 18:40 [PATCH 00/10] TPM2 updates for 4.4 Jarkko Sakkinen
2015-10-16 18:40 ` [PATCH 01/10] tpm, tpm_crb: fix unaligned read of the command buffer address Jarkko Sakkinen
2015-10-18 3:02 ` Peter Hüwe
2015-10-18 11:15 ` Jarkko Sakkinen
2015-10-16 18:40 ` [PATCH 02/10] tpm, tpm_tis: fix tpm_tis ACPI detection issue with TPM 2.0 Jarkko Sakkinen
2015-10-16 18:40 ` Jarkko Sakkinen [this message]
2015-10-18 1:37 ` [PATCH 03/10] sysfs: added __compat_only_sysfs_link_entry_to_kobj() Peter Hüwe
2015-10-18 11:21 ` Jarkko Sakkinen
2015-11-07 0:23 ` Jeremiah Mahler
2015-11-09 22:32 ` Jason Gunthorpe
2015-11-07 2:55 ` [BUG, PATCH " Jeremiah Mahler
2015-11-07 10:55 ` Jarkko Sakkinen
2015-11-07 11:41 ` Jarkko Sakkinen
2015-11-07 18:08 ` Jeremiah Mahler
2015-11-07 22:31 ` Jarkko Sakkinen
2015-11-07 23:11 ` Jeremiah Mahler
2015-11-08 0:49 ` Jarkko Sakkinen
2015-11-08 3:04 ` Jeremiah Mahler
2015-11-08 7:46 ` Jarkko Sakkinen
2015-10-16 18:40 ` [PATCH 04/10] tpm: move the PPI attributes to character device directory Jarkko Sakkinen
2015-11-04 18:17 ` [BUG, bisect, PATCH " Jeremiah Mahler
2015-11-05 9:22 ` Jarkko Sakkinen
2015-11-05 11:05 ` [tpmdd-devel] " Jarkko Sakkinen
2015-11-05 16:47 ` Jeremiah Mahler
2015-11-05 17:46 ` Jarkko Sakkinen
2015-11-05 18:17 ` Jeremiah Mahler
2015-11-06 13:45 ` Jarkko Sakkinen
2015-11-07 2:54 ` Jeremiah Mahler
2015-10-16 18:40 ` [PATCH 05/10] tpm: update PPI documentation to address the location change Jarkko Sakkinen
2015-10-16 18:40 ` [PATCH 06/10] tpm: introduce tpm_buf Jarkko Sakkinen
2015-10-18 2:57 ` Peter Hüwe
2015-10-18 11:19 ` Jarkko Sakkinen
2015-10-16 18:40 ` [PATCH 07/10] keys, trusted: move struct trusted_key_options to trusted-type.h Jarkko Sakkinen
2015-10-16 18:40 ` [PATCH 08/10] tpm: seal/unseal for TPM 2.0 Jarkko Sakkinen
2015-11-07 18:58 ` Jeremiah Mahler
2015-11-07 21:39 ` Jarkko Sakkinen
2015-10-16 18:40 ` [PATCH 09/10] keys, trusted: seal/unseal with TPM 2.0 chips Jarkko Sakkinen
2015-10-16 18:40 ` [PATCH 10/10] MAINTAINERS: add new maintainer for TPM DEVICE DRIVER Jarkko Sakkinen
2015-10-16 19:06 ` [tpmdd-devel] [PATCH 00/10] TPM2 updates for 4.4 Kevin Strasser
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